This kind of VFD is a bit like stepper motor, it need step and direction to work.
You will need a frequency to voltage converter (CNC4PC) have some model.
it will transform the step frequency and convert it to the 0 to 10v necessary to get variable speed control. The more step, the more voltage = more RPM
You will also need another output for the direction that goes to a relay that will make contact between GND of the VFD to the FWD pin of your VFD.
But please take great care reading the manual, mine is like that and yours look to be similar but again read the manual carefully to be sure you're using the right pin.
Jeff